Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.6: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

X-ray absorption spectroscopy of molecular magnets — •Zoe Kugler¹, Patryk Krzysteczko¹, Carl-Georg Freiherr von Richthofen¹, Elke Arenholz², Andy Thomas¹, Thorsten Glaser¹, and Günter Reiss¹ — ¹Bielefeld University, Bielefeld, Germany — ²Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, USA

We investigated the Mn₆Cr single-molecule magnet (SMM) using x-ray absorption spectroscopy (XAS). The C₃-symmetric Mn₆Cr complex is based on three molecular building blocks and has a total spin ground state of S_t=21/2. Any application for this molecuar magnets, such as molecular spintronic devices, require a fundamental understanding of the SMM’s behavior on surfaces.

We investigated Mn₆Cr molecules on different surfaces by using x-ray absorption spectroscopy. To investigate the SMMs structural behavior with respect to the conductivity of the surface we have adsorbed the molecules on top of ’half’ magnetic tunnel junctions (MTJ), where the top layer is the insulating barrier of a conventional MTJ. By varying the thickness of the barrier we could influence the conductivity of the top layer and therefore the interaction of the SMM with the surface. We will present the temperature dependent XA spectra from 3K up to 300K.